of bochitm



Patented June 19, 1928.

UNITED it@ Sv EBERHARDGRASSHOFF, F BOCHUM, GERMANY, ASSIGNGR TO C. OTTO UND COMP. GESELLSCHAFT IVIIT BESCHR-AENKTER HAFTUNG, OF BOCHUM, GERMANY.

ooxn-rusnrns MACHINE.

Application filed March 30, 1927, SerialNo. 179,695, and in Germany May 3, 1926.

It is well-known to fit the pusher head of'coke pushing machines with glide rollers or glide shoes, as with modern coke ovens having chambers of a length of' l2 m and y more, the pusher bar for the machine bends through to such an. extent, that the `pusher head comes Yaground on the chamber Afloor on the rear portionV of the chamber, toward the coke side of the oven. Neither these glide rollers, however, nor the shoes usually mounted on the pusher. bar directly behind the lhead have' been able to diminish the wear of the chamber floor. llVith said shoes which drag over a great portion of the floor, this fact is'to be understood without any explanation, as the friction existing be-V tween the iron shoes and the fioor Vof the chamber, which consists of refractory bricks, is considerable, in particular as the pressure lexerted on the surface of the shoe likewise assumes high vvalues. dueto the heavy load by the pusher headv and bar. -The use of glide rollers was likewise unable to substantially. remedy said drawback of the chamber floor being worn out.V For, already after a very short timethe rollers seize in their bearings, as this is yunavoidable due tothe high temperature prevailingin the chamber' and to the unavoidable penetration of coke dust inthe bearings of said rollers. The rollers then act in a very noxious manner as grinding disks and mill grooves inthe floor of the chamber.r `To obviate these drawbacks, it. has already been proposed to employ socalled freely supported pusher bars, that means bars which bend through, even with greatest lengths of the chambers, only to such an extent that the pusher head does not touch the iioor. Pusher bars of this type, however, must be of avery strong construe; tion in comparison with the usual bars, this causing a considerable increase of' the costs of the entire pushing machine.

Now` my invention. has for its object to utilisev thev advantages of both said .types ofpusherv bars without presenting their drawbacks, that isto maintain the lighter structure ofthe pusher bars hitherto used and therewith to considerably-lower the first `costs of the machine, and on the other hand, to prevent with certainty any ruiming aground of the pusher head. 1

In order to allow my invention to be more easily understood, two embodiments of same are illustrated in the drawing which accompanies and forms On this drawing:

Fig. l shows the parts of' a cokey pushing machine and of an oven chamber in a lateral view, partly in section,

Fig.k 2 is a similiar view of the second embodiment of the coke pushing machine.

.The embodiment shown in F ig. 1 will be described lirst.

A coke pushing machine a is adapted to travel on the machine side along the coke oven battery, the machine being fitted in the usual'way with a pusher bar b carrying a pusher headl c. A supporting shoe d is arranged below. the pusher bar Z) land may run, for instance by means of anti-friction rollers e, above track f fixed on the bar Z. Further antifriction rollers g are mounted below said track on the supporting shoe (l, the distance of which from the rollers e preferably is so chosen, that the rollers g are out of'contac't with the bar I) as long as the upper rollers e rest on the track f. rlhe pusher bar b, pusher head e, and shoe d are arranged so to reciprocate within the oven chamber.

The described machine operates as follows: a

7When the pusher bar Z) isfbeing retired to such an extent, that the pusher head 0 is outside the oven chamber, lthe supporting shoe d rests on the track j directly behind part oil this specification.

the head c. Now the pusher bar b is for- Y Warded.y Its'bending resistance is so determined, that the pusher head e is firstly held in freely supported condition. When the' bar Z) is further forwarded, the bending moment acting upon the bar b increases,'so that the bar successively bends 'more and more. By suitable selection of the conditions itmay be obtained, that the supporting shoe Z touches the floor about in the middle of the chamber. The great friction on the floor causes the supporting shoe to stop at this point, as shown in Fig. 1. YVhen this stoppage takes place, the bar b thence glides along the rollers e until it comes to rest upon the lower rollers g with increasing bending.' In the further pushing motion the rollersy g form a support 'for the bar so' that the freely supportedpportion thereof which car'- ries the head c, is considerably shortened.

lt is obtained in this manner, that the pusher head e is held vfreelysupported even in the portion of the chamber located towards the `ivhilst its other arm is attached to a pull i rodi.. This rod ,extends up to .the cabin i 1 coke side. The. supporting shoe .al is ol a construction permitting it to come aground on the floor Without the pusher head 0 coining aground, with a coi'i.es} ionding bending of Athe bar. As the supporting shoe drags on the floor only a little or doesnot drag al' all, a saving or the floor is obtaiiniid by the described arrangement which has .not been reached hitherto. In returning the pusher bar Z) the inverse stage takes place, as evident. y

The embodiment shown inFig..2 substantially differs from thatv described in so 'far the. shiftingmotion olf the supporting shoe Z is limited by an automatieallyrrelea-sed.lockinggear, 'To this end. a bell? crank lever /iiis mounted for rocking motion aboutpivot efon .theshoe (Z, one arm /ilv of which lever is adapted to loosely engage a keeper,

such-.as eye c1 ixedon the pusherliead c,

ofthe niachine,.iiihere it issuitably guided,

andcarries Va lug ill-adapted to stop the bar z in its extreme .positioiusliown Ain Fig. 2.

When the` .pusher .bar ,b is tornai-ded, the supporting shoe` l is firstly connected tothe head c by the arinL1,.an eye ci.y Then the supporting shoedreaches the middle. ofthe chamber, the lug all of the pull rod strikes on a stop arranged in the cabin of the ina chine. This causes. the bell Acrank lever It toexecute a rockingniotion about its pivot diletothefurther forward motion of the pusher bar ZJ, ,whereby the arm h1. of the bell: crank lever t is lifted out of the eye ci, the

locl; existing ,between the supporting .shoe

and the pusher head c thus being released..

The supporting. shoe is` `maintained in this position Land comes to resten the .floor` due to theA pusher. bar b bending down. Thestage takingcplace `with further vforwarding of the pushery bar o is thesamel as described with.

reference to'thelirstembodiment. When the pusher-, bar Z) is moreel in, shoe CZ and pull rod z' yare ,returnedgso "that the lever arm `/i,1 is

automatically rocked about pivot /t and en.

gagesagain the eyeel. The supporting shoe, Z thus being locked again with the.

friction in its supporting bearingdn the house a, rocksk the bell crank 7L as the shoe d is returnedpwhen,the shoe 4is struckby the pusherhead c. This enibodiment offers the further yadvantage that thesupporting shoe f isunable at all to drag on the [loor oil' the chamber and comes .aground always at a predeterminated. place due to the releasing of the shoe .d frompusherhead c.

What I Vclaim as my inventiony and desire to secure by Letters-Patent, iszl. Ina coke,pushingfmachine for coke ovens a pusherbar adapted to reciprocate,A

a pusher head mounted. ithereoinfa trackpar-v ranged on.` said bar, a member runningrfon,`

said` track and arranged beloivsaidbar, said in. the. pushing oper-ation,andiantifriction ,80 member coming' aground ont-he lioor of stheVv ovenrliamber as .the pusher bar ybends downs.

3. In acoke pushing machine for coke...

ovens a pusher bar adapted to ,.I'eciprocate,

a. pusher head mountedithereon, a member;A

slidably connected Withv said fbar .lands arranged .below said bar, said. member.comv-x ing aground on they floor o the oveneham-.

arranged below. saidbaijbetween .saidfz'bar and said member. contactingA Withzsaidabar..

a fte-r, saidineinber has come aground.

4. lfn awoke pushing machine foreokey ovens a pusheribar adapted to reciprocate,z a pusher head mountedv thereon, amen'rber slidably connected with said bar below7 the bar, said :member Icoming. aground. o1r the floor` of the oven cli-amber as the `pusher bends downin the push-ing operation, means for lockingisaid member-,ina positioninearff said pusher liead,.=and ineansti'or. releasing said locking means.

5. In a.V coke pushing machine for'icoliey ovensa pusher bai-adapted to-reciproeate,

a pusher head mounted thereon, a. member`A slidably connected withsaid` bar below-the bar, said member coming aground 4 onthel floor I'olf the oven chamberas the pusher barl bends down in the pushing operation, meansfor locking said member. in aposition nearI said pushing head, 'and means for automat-ie cally releasing said lockingmeansiafter-ia predetermined forward motion of.' said pusher bar.

(. In a coke .pushing machine ,foiwcoke ovens. a pusher baif.adaptedY to reciprocate,-

a pusheiyhead mounted thereon, a vmemberV ing means inovably mountedlon said 'nl em ber, a keeper provided. onfsaidpusherhead and engaged by said locking means, a pull slidably connected with said bar tbelow the y bar, said llmeinber; coming aground lontthe rod connected to said locking .ineansto actu ate it, a lug arranged on a stationary part ofy the machine, and a stop face on said pull rod cooperating with said lug to stop said pull rod after a predetermined forward motion of said pusher bar, so as to release the locking means.

7. In a coke pushing machine for coke ovens a pusher bar adapted to reciprocate, a pusher head mounted thereon, a member slidably connected With said bar below the bar, said member coming aground on the floor of the oven chamber as the pusher bar bends down in the pushing operation, a bell crank lever pivotally mounted on said member for rocking motion one arm of said bell crank lever releasably engaging said pusher head, a pull rod connected to the other arm of said bell crank lever, a lug arranged on a stationary part of the machine, and a stop :face on said pull rod cooperating with said lug to stop said pull rod after a predetermined forward motion of said pusher bar.

In testimony whereof, l have signed my name to this specification.

E. GRASSHOFF. 

